Duffel bag



FIG. 1 is a perspective view of a duffel bag showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof, the opposite side view is a mirror-image thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The dash-dot-dot broken lines illustrate portions of the duffle bag and form no part of the claimed design. 

CLAIM The ornamental design for a duffel bag, as shown and described. 